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Giffard airship

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Ada Lovelace shortly before her death in 1852

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ReferencesEdit

  1. ^ BirdLife International (2004). "Pinguinus impennis". IUCN Red List of Threatened Species. Version 2006. International Union for Conservation of Nature. Retrieved 11 May 2006.
  2. ^ "Lambert-Beer Law". Sigrist-Photometer AG. 2007-03-07. Retrieved 2007-03-12.
  3. ^ Wilson, Robin (2002). Four Colors Suffice. London: Penguin Books. p. 18. ISBN 0-691-11533-8.
  4. ^ Cayley, Arthur (1879). "On the colourings of maps". Proceedings of the Royal Geographical Society. Blackwell. 1 (4): 259–261. doi:10.2307/1799998. JSTOR 1799998.
  5. ^ Penguin Pocket On This Day. Penguin Reference Library. 2006. ISBN 0-14-102715-0.
  6. ^ King, William T. (1896). History of the American Steam Fire-Engine.
  7. ^ Marshall, A. (1920). "The Invention and Development of the Shrapnel Shell" (PDF). The Field Artillery Journal: 12–18. Retrieved 2012-03-08.